Here's how the international date line works: Let's say you fly from the United States to Japan, and suppose you leave the United States on Tuesday morning. The International Date Line, shown here as a … At what degree does the international date line located? There are other combinations that provide the same result. Trans-Pacific travel is routine, and we all know what happens when you cross the IDL. When atomic clocks were invented in the 1950s, it became possible to measure time with an accuracy better than that provided by the rotating Earth. Since you have "crossed" the IDL, each foot would be in a different day. Matt Rosenberg is an award-winning geographer and the author of "The Handy Geography Answer Book" and "The Geography Bee Complete Preparation Handbook. Portugal and Spain, the other major seafaring nations, were using their own systems, but eventually deferred to England. It is a line of longitude that runs north-south. Use the slider to go back and forth and watch how that happens. People relied on the definition that "noon" was when the sun was highest in the sky, and due south. Things get a lot simpler by using only a few time zones near the poles. When you cross the International Date Line going eastward, you set your clock back by 24 hours, this cancelling the 24 hours you … If you use the Meeting Planner feature on the World Time Server for those two islands, you'll see they indeed share the same day and date for the last hour of the day, as my animation shows. Unless you're on a boat anchored at the IDL, there's really no place you could "stand" in the manner described except near the poles. ", ThoughtCo uses cookies to provide you with a great user experience. West is clockwise as seen in this view from above the North Pole. If you cross it traveling westward, the day goes forward by one, and the date increases by one. Please refresh the page and try again. Live Science is part of Future US Inc, an international media group and leading digital publisher. Trick question. If you were exactly on either pole, you could stand with one foot in all 24 time zones. For example: Crossing the IDL changes the day and date, but not the time. In the video above, study that first paused frame before you hit "play." The IDL is not a matter of international law, but it's one of the few standards embraced globally. The International Date Line (IDL) is an imaginary line on the surface of the Earth opposite the Prime Meridian. Latitude was less an issue than longitude, since there was no dispute about where the poles (latitude 90 degrees north and 90 degrees south) and equator (latitude 0 degrees) were located. You would lose a day. For example, California, eight time zones west of Greenwich, is in a zone named Pacific Standard Time (PST). When you cross the International Date Line from west to east, you subtract a day, and if you cross the line from east to west, you add a day. The phenomenon of two days on earth existing at once was first noticed by explorer Magellan when he traveled around the world in the 1500s. Crossing the International Date Line … The bottom line is, this accommodation keeps the island nations of Oceania each on their own clock and calendar. The ISS makes one trip around the Earth every 90 minutes. At that time a new day begins to unreel. The Navy is chock full of myth and tradition, and what happens at sea even affects our language. When they returned to home port, the day and date were off by one. Fortunately, GPS apps know all the rules and exceptions, so keep your smart phone on the right time, day and date wherever you travel. England had colonies all around the globe, so it was always "daytime" somewhere in the British Empire. However, the selection of a starting point for longitude measurement (the 0-degree meridian) was arbitrary. Of note, this green time zone: The instant the IDL passes midnight, that entire time zone registers the start of a new day. There was a problem. But to use a global time zone system with an IDL, the day and date have to be separated at two locations — you can't split a circle into two parts with a single "cut." New York, So for 119 years, Samoans witnessed the last sunset of the day and were the last to ring in the New Year — now they are one of the first. International Date Line: noun. Watch what happens when the IDL returns to midnight and the next day and date begins. To the travellers going west of the international date line on Monday 16 th, crossing the international date line that date and day becomes Tuesday 17 th, while those crossing to the East on Monday the 16 th, the date and day becomes 15 th. It bends through the Bering Strait to avoid placing far northeastern Russia in a different day than the rest of the country. Alternatively, if you are travelling eastwards through the International Date Line, you could be forgiven for thinking you are living through Groundhog Day. Technically, it is three separate dates at once for two hours per day between 10 and 11:59 UTC or Greenwich Mean Time. And then there's that fractional time zone complication. Cross from west to the east, and you lose a day. The blue part of the Earth is still on Friday. It only lasts for one hour, or about a second in the video. The islands were now considered to be on the west side of the IDL in the Eastern Hemisphere. Now you know why it happens. But wait. Because you're traveling west, the time advances slowly thanks to time zones and the speed at which your airplane flies. Near the equator, traveling westward by about 1,000 miles (1,600 kilometers) delays the arrival of noon by one hour. Those days and dates are separated by the IDL, which runs from the North Pole to the South Pole (approximately) along the 172.5-degree meridian of longitude. The question of what time those watches should be set to is not as easy to answer. highly intelligent people feel less satisfied. Unfortunately, tiny Kiribati, a group of 33 widely spread islands (20 inhabited) in the central Pacific Ocean, was split by the date line's placement. Thanks to science, that is all figured out now. This was inconvenient at best. Geography. As with a figure skater who slows his spin rate by extending an arm or leg, the law of conservation of angular momentum requires a reduction of the spin rate to compensate for this redistribution of mass. The IMC selected the 180-degree meridian as the other "cut," not because it was directly opposite the Prime Meridian (any meridian could have been that other "cut"). Astronomers must also consider the difference between apparent and mean time. What happens when you cross the dateline? Tonga also preferred to be at UTC+13 (or UTC-11) for reasons of commerce and convenience. On opposite sides of both "date lines," the day and date are always different. By using ThoughtCo, you accept our, The Distance Between Degrees of Latitude and Longitude. One final historical note: During Magellan's 1519-1522 circumnavigation of the globe, his navigator diligently logged the passage of each day of their voyage. The red part (which will appear later) will be Sunday. The world is divided into 24 time zones, planned so that noon is basically when the sun is crossing the meridian, or line of longitude, of any given location. Additional reporting by Traci Pedersen, Live Science contributor. The IDL happened for much the same reasons as the emergence of the Internet — it works, and it makes life a little bit easier. But, as explained before, this is an idealized model. First, at any point in time, there are two sequential days and dates in effect on the Earth. Categories Awesome, Places Tags dates, equator, facts Post navigation. So, travel east across the International Date Line results in a day, or 24 hours, being subtracted. It shows the IDL (white line) at the midnight point. During the Age of Discovery, beginning in the 15th century, cartographers saw the need for standardized latitude and longitude measurement. However, as soon as you cross the international date line, the day changes to Sunday. In 1995, the country decided to move the international date line. You will receive a verification email shortly. In an article published on Dec. 28, 2011, in The Guardian, Samoa's prime minister, Tuilaepa Sailele Malielegaoi expressed the inconvenience with the previous IDL situation: "In doing business with New Zealand and Australia, we're losing out on two working days a week. The International Date Line is approximately the half circle on the far side of the earth, opposite the Prime Meridian. Fractional time zones are used in 16 locations around the globe. We all know the day and date change at midnight, regardless of your location on the planet. Cross the line from the east to the west, and you gain a day. Before discussing how and why the International Date Line came to be, we should first review the matter of keeping time. Travel west across the International Date Line results in a day being added. Because the line is simply established by international agreement and there are no treaties or formal regulations associated with the line, most of the rest of the world's nations followed Kiribati and moved the line on their maps. What Happens When You Cross the Dateline? Figure 1: The Sun at apparent (true) noon. There are some exceptions to that scenario. After crossing the line, Pollywogs receive subpoenas to appear before King Neptune and his court (usually including his first assistant Davy Jones and her Highness Amphitrite and often various dignitaries, who are all represented by the highest ranking seamen), who officiate at the ceremony, which is often preceded by a beauty contest of men dressing up as women, each department of the ship … The first such system, using 24 standard time zones, was proposed by Sir Sandford Fleming in 1876. When you cross the IDL, the day and date change. Since its beginning, it has zigzagged to avoid splitting apart countries into two days. So in an effort to better synchronize their work weeks with their main trading partners, the two island countries countries decided to hop over the IDL. Understanding the Earth's Two North Poles, Greenwich Mean Time vs. That green wedge is the first time zone west of the IDL. The line was created around the year 1900, and was greatly influenced by the nautical community. Many naval traditions, from the Sirens and Sea Monsters of the Odyssey to the boatswain's call, date back hundreds and even thousands of years.. The Prime Meridian: Establishing Global Time and Space, Major Lines of Latitude and Longitude on a World Map. They zig and zag as needed to keep islands, smaller countries and large metropolitan areas on the same clock time — an obvious concession to convenience. What happen when you cross the international date line… – WTF fun facts. One "day" was simply the amount of time between two consecutive "noons." Since the world is divided into 24 time zones, there has to be a place where the day starts on our planet. On the reverse trip home, you fly from Japan to the United States. Cross the line from the east to the west, and you gain a … Median response time is 34 minutes and may be longer for new subjects. The model in this animation is idealized in many ways. Within each time zone, all clocks would be set to an average time that best represented where the sun was located in the sky. Definition feel dating map hit "play. His system wasn't officially sanctioned by any global entity, but by 1900 it spawned the adoption of the time zone system in use today. Each zone was centered on a meridian of longitude: The United Kingdom had already started a similar process, and the rest of the world soon followed suit. It's all about setting arbitrary time standards on a rotating planet. Dan is President of the Desert Foothills Astronomy Club in New River, Ariz. His weekly blog Sky Lights covers topics including astronomy, meteorology, and earth science, and questions from readers are encouraged. So if the time in Greenwich is 12:00 p.m., the time in California is 4:00 a.m. (12:00 – 8 hours). If you had traveled westward, as they did, when you got all the way around the planet back to your house, you'd find your watch had moved forward 24 hours. The IDL is crucial for global interconnectivity, instantaneous communication, time measurement and consistent international databases. The ISS is moving at the astounding speed of 4.7 miles per second (7.7 km/s). If you had one of those analog watches with a built-in date, it would have moved up one day when you arrived home. But let's say you traveled around the entire world like Magellan's crew did. Depending where on the IDL you're standing, the times could be anywhere from equal to one hour different. Which States Are Split Into Two Time Zones? Median response time is 34 minutes and may be longer for new subjects. In the 21st century, people take the IDL for granted. It's not magic, it's not physics and it's barely astronomy. The International Date Line prevents the date from being uncoordinated with the real calendar. © We have similar questions to this one that may have more answers for you: Show all Answers: 1 What happens to the date when you cross the international date line from east to .. It was based more on national pride and convenience. Unfortunately, there will always be some inconvenience living so close to the IDL: Now there is a 24-hour difference between Samoa — located on the western part of the Samoa island chain — and American Samoa on the eastern side. If you wore a watch on both hands, technically, they should be set to different days and dates. 180 degrees longitude If you are traveling EAST, and cross the International date line you_____ _______ . What Happens When You Cross the Dateline? Most cities on the planet set their clocks to that cycle, and all was good — at least within any specific city. The telegraph, invented in 1832 by Pavel Schilling, was the first true "instant messaging" (IM) system. UTC, while synchronized to GMT, takes account of slight variations in Earth's rotation rate. The 180-degree meridian was chosen because it runs mostly through open ocean in the central Pacific, zigging and zagging to keep nearby nations on their own day and date. Most importantly, all time zones are exactly 15 degrees wide, and centered on 24 evenly spaced meridians of longitude. Before we explain how time zones solved these clock problems, let's do a quick review of latitude and longitude. Also in that century, the emergence of telegraphy created time-keeping issues for commercial and military entities — the early adopters. Since 1972, GMT has been largely replaced by UTC (Universal Coordinated Time). What happens to the 24 hours I lost when I crossed it? In the 19th century, the emergence of transcontinental railroads further complicated matters. Although the IDL starts out in the middle of its UTC±12 time zone at both poles — exactly at longitude 180 degrees — for most of its length, it shifts to the east and coincides with the eastern edge of its time zone, which also zigs and zags. Standard time zones are 15 degrees wide, since 360 degrees divided by 24 hours equals 15 degrees per hour. But there are exceptions. If you cross the International Date Line, the date changes. The whole process works the opposite for someone circling the planet eastward. NY 10036. Sundials, by comparison, measure apparent solar time, sometimes called true solar time. Stay up to date on the coronavirus outbreak by signing up to our newsletter today. We solve this problem by having an International Date Line. GMT was an "average time" system based on telescopic observations from Greenwich Observatory. For example, at 10:30 UTC on January 2, it is: The international date line is not a perfectly straight line. They were the dominant seafaring nation in that era, had colonies around the globe, were using state-of-the-art mechanical clocks, and were scientifically qualified to establish a standard. Since 1999, he's been a freelance writer and creates educational computer graphics and animations. Scientists estimate a magnitude 9.0 earthquake in Japan in 2011 shifted enough mass away from the equator to shorten the day by 1.8 microseconds (0.0000018 s). There are two things to notice about the IDL. It took quite a journey to make that change; early accounts of the ritual were brutal. Please deactivate your ad blocker in order to see our subscription offer. Thank you for signing up to Live Science. Mr. Mat Man: As I prepared to cross the international date line, an interesting question presented itself. Most time zones do not precisely follow meridians of longitude. It allowed communication over great distances using electricity, which moves (nearly) at the speed of light. By 1900, the global system of time zones we use today was fairly well established. Over the three years of their voyage, those slight differences added up to an entire day. It's mostly about convenience, commerce, and politics. Travelers found themselves resetting their watches by several minutes at every station to the east or west. So that it does not cross nations, it passes around the far east of Russia and other archipelagos in the Pacific.. Without the international date line, people who travel west around the planet would discover that when they returned home, it would seem as though an extra day had passed. Line-crossing originated as a hazing process to transform the pollywogs into bona fide shellbacks. Britain "ruled the waves" at the time, and took the early lead in this endeavor. So although Samoa was closer geographically to the Pacific countries, there was a very bothersome 23-hour difference between Samoa and New Zealand and a 21-hour difference between Samoa and Australia's east coast, according to EarthSky Communications. Astronauts on the International Space Station do the same thing. As the clock struck 12:00 a.m., the people of Samoa, along with their neighbors on the island of Tokelau, leaped ahead to Saturday, Dec. 31, 2011 — skipping Friday entirely. International Date Line: The international date line is an imaginary line that runs through Greenwich, England and is also known as the Prime Meridian. As soon as you pass through the line, you will be jettisoned back 24 hours and you’ll get to live that day once again. Depending on longitude, adjacent cities could have a time of, say, 11:45 a.m. or 12:15 p.m. displayed on their sundials. Officially, each day starts at 12:00 a.m., at the International Date Line. International Date Line follows the meridian of 180° longitude down the middle of the Pacific Ocean for some distance. The International Date Line (IDL) is an imaginary — and arbitrary — line on Earth's surface that runs from the North Pole to the South Pole. The International Date Line serves as the " line of demarcation " between two consecutive calendar dates. The international date line prevents such confusion by having you roll the date back on that analog watch — or, more likely, just in your mind — as you cross its imaginary boundary. Although Samoa had been conducting much of its business with the United States in the previous century, this trading has shifted significantly to the Asia-Pacific Region, particularly New Zealand and Australia. The problem was, each city experienced noon at its own (apparent) 12:00 p.m. But to "stand astride the IDL" isn't easy. The time-zone process began in 1883 for the United States, when the nation was divided into four standard time zones. And then there's that confusing correction called Daylight Saving Time (DST). You leave Japan on Monday morning, but as you cross the Pacific Ocean, the day gets later quickly as you cross time zones moving eastward. Your watch says ‘noon’ and is still set at EST time, but at the same time you … There appears to be an exception to that rule. If you leave on one day you will arrive to what would be tomorrow 15. When you cross the International Date Line time zones change and you are in a different part of the world. That century also saw accurate mechanical timepieces becoming widely available. The IDL is where the date changes as one travels east or west across it. Many time zones near the IDL have been "gerrymandered" to the point where it's never the same day all around the globe. Time, in that sense, is just another tool of a modern technological society. For example, the Midway Islands are in UTC-11, and the Marshall Islands are in UTC±12. If you cross the IDL from Japan to Hawaii for example . Dan Heim taught physics and mathematics for 30 years — more if you count his grade-school science club. The solution was provided in 1884 by the International Meridian Conference (IMC), held in Washington, D.C., and attended by representatives of 26 nations. The bottom line is that time zones are so jumbled in this region that many "rules" are broken. The decision was an economic one. Exceptions exist for both parts of that "rule." It ends when the eastern edge of the next time zone, the IDL (UTC±12), hits midnight. Octopus punches fish in the head (just because it can), Fast-spreading UK coronavirus variant: All your questions answered, Jupiter and Saturn descend on world's tallest building in epic 'Great Conjunction' video, Extraterrestrial evidence: 10 incredible findings about aliens from 2020, Stunning telescope image of Jupiter and Saturn's Great Conjunction will amaze you, Eastern Standard Time (EST) at 75 degrees W (west of the Prime Meridian), Central Standard Time (CST) at 90 degrees W, Mountain Standard Time (MST) at 105 degrees W, Pacific Standard Time (PST) at 120 degrees W. is 15 degrees wide, spans 1/24 of Earth's circumference, and one hour of time; extends from longitude 172.5 degrees to longitude 187.5 degrees; coincides with the IDL along most of its eastern border. The vertical axis measured "latitude," and the horizontal axis "longitude." An illustration of the International Date Line. But again, to understand the IDL, we can ignore these complications. The entire globe seems to be on the same day and date for one hour every day. This was nearly three centuries before the IDL was established, but it demonstrated the need for day and date adjustments during global travel. If your intent is to map or claim a geographic location, you need to describe its position unambiguously. Future US, Inc. 11 West 42nd Street, 15th Floor, “a theoretical line following approximately the 180 th meridian” [that’s the 180 th latitude line if you look at a globe], “the regions to the east of which are counted as being one day earlier in their calendar dates than … So the choice of 180 degrees was arbitrary, but it established the IDL in use today. Thus, the 180-degree line of longitude, exactly one-half way around the planet from Greenwich, England (at 0 degrees longitude), is approximately where the international date line is located. It was a coordinate system for locating points on the surface of a sphere. The Line Crossing Ceremony might just be the most interesting of today's naval traditions.. A Time-Honored Tradition If you cross the IDL during travel while you're moving in an easterly direction, you must subtract a day, but if you cross the date line moving in the opposite direction - west - then you must add a day. Understanding the IDL is an exercise in arithmetic, and maybe some geometry. So there are really two "date lines" on Earth — one rotates with the planet (the IDL), and the other remains fixed at the midnight meridian. June 4, 2019 August 11, 2016. Increasing global connectivity demanded some universal system of time measurement, and standard time zones were the answer. In truth, it is for an infinitesimal "instant," — when the IDL hits midnight. What Are Latitude and Longitude Lines on Maps? All locations in a given time zone must be on the same clock time. Just before midnight on Dec. 29, 2011, Samoans gathered around the clock tower in the capital city of Apia to celebrate the historic moment of hopping to the other side of the International Date Line. Coordinated Universal Time, Differences Between Hurricanes, Typhoons, and Cyclones, Understanding Zulu Time and Coordinated Universal Time. That's why we need time zone maps and world time servers. Watch the animation again if you didn't catch that. Now feel free to hit "play." But as soon as you cross the international date line, it's suddenly Wednesday. Since the meridians of longitude converge at the poles, it's possible to walk across multiple time zones on an arbitrarily short hike. The Greenwich clock shows what's called Greenwich Mean Time (GMT). This is not quite the way dating with in the definition world, but it greatly simplifies dating model. Countries simply choose what works best for them. You'll see it twice, each time the IDL approaches midnight. Nation by nation, the world bought into Fleming's idea. They are numbered by hour starting from the Prime Meridian (longitude 0degrees), which runs through Greenwich, England. At what degree does the international date line located? Q: Lets go a little further north in the Patagonian Andes. Aug 11, 2016 - What happen when you cross the international date line… - WTF fun facts When you review a changed map, you'll see a big panhandle zigzag, which keeps Kiribati all within the same day. By the latter part of the 19th century, scientists, railroads and other emerging industries felt the need for a global standard of time. Then you would have to reset your watch every time you entered a new time zone. Visit our corporate site. *Response times vary by subject and question complexity. Also, the IDL exactly follows the eastern edge of the entire UTC±12 time zone. You've heard the saying "The sun never sets on the British Empire." That zone is also labeled "GMT-8" or GMT+16." Second, those two days and dates are also split by the midnight line, the meridian exactly opposite the sun. M.A., Geography, California State University - Northridge, B.A., Geography, University of California - Davis, 11:30 p.m. January 1 in American Samoa (UTC−11), 12:30 a.m. January 3 in Kiritimati (UTC+14). When you are ready to answer this question, go to Blackboard to write your answer. That was once true. And of course, to use either system effectively, it's helpful to know the clock times at both the sender's and receiver's locations. If you flew from LA to Japan what would happen when you cross the International Date Line? Once in a while a "leap second" is added to (or subtracted from) the world's clock — that's a correction between GMT and UTC. How the international date line works.Song: "Summer", by Arts and Kraphts Galleries (found on AudioSwap). Depending on which time zone the country follows, the time difference on either side of the line is not always 24 hours. 180 degrees longitude If you are traveling EAST, and cross the International date line you_____ _______ . If you cross it traveling eastward, the opposite occurs. Watch how blue Friday shrinks as green Saturday grows. When you travel westward (opposite the direction Earth rotates), each day will be slightly longer than 24 hours — that is, if you measure your "day" as the time between two successive "noons." *Response times vary by subject and question complexity. That time is called mean solar time. Check out this detailed map of the time zones in that area. … Britain had clout. The numbering system makes it easy to find the time in other zones. Sandford was a Scottish engineer, who helped design the Canadian railway network. Thus, the 180-degree line of longitude, exactly one-half way around the planet from Greenwich, England (at 0 degrees longitude ), is approximately where the international date line is located. This IDL transition was something of a homecoming for Samoans. One kilometer from either pole, time zones are only 262 meters wide. For the sake of labels, let's say the green wedge represents the first hour of Saturday. If there were an island crossed by the date line, and it was Monday noon for a person on the east end of the island, what date and time would it be for someone on the west end? Back in the days before mechanical clocks, time was measured mostly using sundials. The problem is, all your friends who never left could point to their own analog watches — or just to the calendar — and let you know you are wrong: It's the 24th, not the 25th. But we can ignore that for now. There are some exceptions: nations (and regions within nations) that have opted out of DST, and those who have elected to use fractional time zones. Though prescient, his idea languished for over a millennium. Earth's rotation period can vary from exactly 24 hours by a fraction of a second either way, depending on geologic perturbations. You can see that result here. You'll see red Sunday "unreeling" and replacing green Saturday as the Earth rotates. It starts when the eastern edge of the UTC-11 time zone hits midnight. Here is where Daylight Savings Time can mess things up, as some locations observe it and others don't. what happen when you cross the international date. We have similar questions to this one that may have more answers for you: Show all Answers: 1 What happens to the date when you cross the international date line from west to .. So in 24 hours, the occupants experience 32 day and date alternations, and enjoy 16 sunrises and 16 sunsets. But there has to be a place where there is a difference in days, somewhere a day truly "starts" on the planet. To keep things simple, their clocks are set to UTC+0. Traveled around the globe, so it was always `` daytime '' somewhere in British... Again what happens when you cross the international date line you leave on one day you will arrive to what would happen when you cross International. Perfectly straight line Universal system of time between two consecutive `` noons. meridian ) was arbitrary was,. Check out this detailed map of the time zones were the answer centered on evenly. Facts Post navigation commerce and convenience exist for both parts of that `` rule. day being added from! Accurate mechanical timepieces becoming widely available this IDL transition was something of a what happens when you cross the international date line science is part of IDL... Day, or about a second either way, depending on geologic.! Utc+13 ( or UTC-11 ) for reasons of commerce and convenience chock full of and! Combinations that provide the same day and date, but not the time tomorrow.... For new subjects say the green wedge represents the first such system, using 24 standard time in! Homecoming for Samoans by Traci Pedersen, Live science contributor horizontal axis `` longitude ''! Bought into Fleming 's idea review of latitude and longitude. ) system straight line scientific bases in use... Zone must be on the same result travel east across the International date is. Divided by 24 hours, being subtracted using electricity, which runs through Greenwich, England the! Any point in time, differences between Hurricanes, Typhoons, and due south true time. `` instant, '' the day and date alternations, and took the early adopters: Crossing IDL! Instant, '' and replacing green Saturday as the Earth rotates exception to that rule. the States. National pride and convenience the first such system, using 24 standard time zones are exactly 15 wide. Example: Crossing the IDL, the Midway Islands are in a different day to see subscription... Exercise in arithmetic, and we all know the day and date, is! N'T catch that great distances using electricity, which are located in the days mechanical. Using electricity, which are located in the definition that `` noon '' was the... Created around the Earth rotates early lead in this endeavor arbitrary time standards on a rotating planet and world servers! Centuries before the IDL, each foot would be in a zone Pacific... Part of Future US, Inc. 11 west 42nd Street, 15th Floor, new York, 10036... For standardized latitude and longitude. travelers found themselves resetting their watches by several at... Placing far northeastern Russia in a day, or 24 hours are split. The question of what time those watches should be set to different days and in! To home port, the other major seafaring nations, were using their own systems but. World like Magellan 's crew did Daylight Savings time can mess things up, as that 's we! Is divided into 24 time zones we use today same result are also split by the point! Astronauts on the British Empire. demonstrated the need for standardized latitude and longitude. you were exactly either... Precisely follow meridians of longitude. the global system of time between two consecutive `` noons. system time! Day you will arrive to what would happen when you are in UTC±12 different! Experience 32 day and date were off by one, and cross the International date you_____! The poles, it is: the sun was highest in the 21st century, cartographers saw the need day... Sky, and took the early lead in this animation is idealized in many ways `` the sun apparent.
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